Downy Mildew

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Downy Mildew

This disease can be recognized by the gray, dark spores that grow on the under sides of leaves. The fungus can grow systemically through the plant. Small yellow spots may develop on the upper sides of leaves. Infected leaves and branches may become distorted and die. The disease favors cool temperatures and high humidity. Note: Downy mildew can sometimes be confused for powdery mildew or botrytis.

Host Range: basil, cucurbits, crucifers (cabbage , cauliflower, etc.), flowers, and more

Yellow spots on upper side of a cucumber leaf

Yellowing and browning of basil leaf

“Basil (Ocimum basilicum): Downy mildew, caused by Peronospora belbahrii” by Scot Nelson is licensed under CC BY 2.0

Dark spores on the lower side of a cucumber leaf

Spores on the lower surface of a basil leaf

“Sweet basil (Ocimum basilicum): Downy mildew, caused by Peronospora belbahrii” by Scot Nelson is licensed under CC BY 2.0

Brown lesions on tomato stem

Late blight of tomato (Lycopersicon esculentum) in a garden near Hilo, Hawaii, caused by Phyophthora infestans” by Scot Nelson licensed under CC BY 2.0

Yellow spots on upper side of cucumber leaf

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